Like Beta 2, the RC release is a fully supported go-live release that you can use for live projects and production environments.
You can find out a lot of information about the Test and Lab Management products at http://blogs.msdn.com/vstsqualitytools/ and http://blogs.msdn.com/lab_management/ respectively, including information about what’s new in the RC release, as well as a set of videos that help you understand the product capabilities.
Several customers have already installed the products in their production environments, and their feedback has been great. I would strongly encourage you to take advantage of the go-live RC release and try out the Test and Lab Management products. I and my development team will be happy to hear from you about your experiences and help you out with any questions you may have.